1上钢琴课。2取得好成绩。3学习一门外语。4演奏一种乐器。[翻译成英文]

1上钢琴课。
to attend piano class / to have piano lesson

2取得好成绩。
to get a good score/ to get high marks/ to make a good achivement

3学习一门外语。
to learn a foreign language/ to study a foreign language

4演奏一种乐器。
to play a kind of instruments / to play a instrument